Due to multiple factors, expect to potentially pay more when booking in December. For low rates, October can be a great choice for travel to Montego Bay. Flights to Montego Bay from Johnson City in October are about $762 on average during October, but can be found for as low as $523.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Johnson City to Montego Bay as you normally would.